This disambiguation page lists articles associated with the title UPD. If an internal link led you here, you may wish to change the link to point directly to the intended article.
Chronic smokers often have difficulty breathing because they develop Chronic Obstructive Pulmonary Disorder, or COPD. The two diseases that fall under that category are emphys â¦ ema and chronic bronchitis.
Chronic Bronchitis. Chronic bronchitis is a serious illness with a persistent cough, often caused by long-term smoking, although not everyone with chronic bronchitis is a smoker or former smoker. People sometimes mistake chronic bronchitis for a smoker's cough..